12) The quick return motion in a slotter is obtained by :

Whitworth mechanism

Crank and slotted link mechanism

Fast and loose pulley mechanism

Cam mechanism

Answer is:

Whitworth mechanism

Explanation:

The quick return motion in a slotter is obtained by Whitworth mechanism.

The diameter of the blank is less than that required

The flat-to-flat size is incorrect

Either 'A' or 'B'

Neither 'A' nor 'B'

Answer is:

Pawl and ratchet wheel mechanism

Worm and worm wheel mechanism

Cam mechanism

Bevel gear mechanism

Answer is:

Explanation:

Pawl and ratchet wheel mechanism is used for driving the main shaft of a slotter.

In a slotter, the feed is given at the beginning of the cutting stroke

The feed mechanism in the slotter is used to drive the tool

For slotting external hexagon, a ring of diameter less than the distance flat-to-flat is required to support the job

In a slotter, the feed direction can be reversed

Answer is:

Stellite tool

Cemented carbide tipped tool

High carbon steel tool

High speed steel tool

Answer is:

Explanation:

Cemented carbide tipped tool can cut efficiently with negative rake angle on hard metals.